Display Data Channel
  • DDC version 1
    • DDC1 protocol
    • DDC2B protocol
    • DDC2Ab protocol
    • EDID 1.0
  • DDC version 2
    • DDC2B+ protocol
    • It splits EDID into a separate standard and introduced the DDC2B+ protocol.
  • DDC version 3
    • DDC2Bi protocol
    • It introduces the DDC2Bi protocol and support for VESA Plug and Display and Flat Panel Display Interface on separate device addresses, requiring them to comply with EDID 2.0.
  • Physical link
  • Pin 12
    • a data line that continuoulsy transmits the 128-byte EDID block, and the data clock is syncronised with vertical sync
  • DDC CI(Command Interface)/MCCS(Monitor Control Command Set)
    • over a a bidirectional link such as DDC2Ab/Bi/B+
    • a means for a computer to send commands to the monitor, as well as receive sensor data from the monitor
    • DDC/CI is a protocol designed by VESA to configure monitor by software, using two wires on the VGA or DVI cables, which forms an I2C bus.
    • DDCcontrol Documentation 0.4
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